There is no such thing as titanium gears. They are aluminum with Ti plating. Steel will be strongest, brass will be longer wearing, aluminum will simply be lightest and also weakest.
JX servo is a bit of unfortunate circumstance for me. They are a former employee of my OEM, took the engineering work I did on the 12v servos and started JX. Not surprising that they are using cheaper gear and pin materials though, that is standard china practice to make things as cheaply as possible but look like the "quality" knockoff. I can see plainly that they took the entire design from the V1, which had enough flaws to warrant a V2. There is also a "new" 12v servo on the block that JX is supplying. Good luck buddy, I already know what your failure rate is going to be. Better be prepared to lose your shirt or piss off a lot of people. Even my own OEM had some choice words about the quality of JX, and you know it is bad when a chinese company is talking crap about quality.
My v1 gearset should drop into the JX case. If anybody wants affordable gears, give them a shot. I'll refund your money if they don't fit. Most likely, your case is already too damaged to avoid further gear issues though.
